The stock convertor should work fine.
Was there any junk in the transmission?
If so it will be in the convertor as well.
You can have it flushed but you need the proper equipment to perform this task.
At that time they will check end play in the unit and proper function of the over run clutch.

You didnt tell us your motor but if its a 302 your not going to happy with a stock converter. A 302 putting out 400hp takes alot and most likely is built up, I would guess something with at least 2000-2500 would work alot better. Will a stock converter work, yes, will you be happy with it? no Give us some more details on your motor.

Here we go with stall speeds.
This is the least understood area of automatic transmissions.

A stock convertor behind a stock engine will give a certain stall speed.
Put that same convertor behind an engine that has some jam to it and you will get a higher stall speed.

Stall speed is directly related to how much torque the engine produces.
Sure you can shave the turbine, pump, and stators in a convertor.
This will produce a higher than stock stall speed on any engine.
Again put that same higher stall speed convertor behind a different engine and it will produce a different value.

Your engine will tell you if it doesn't like the stocker. A warmed up engine will inevitably want to work in a higher rpm range from idle thru cruising, to top end. Stock converters are usually designed to be really tight and have very little rpm slippage @ grocery getting. If your engine doesn't like the stocker, it will bog and stall at low rpms - equivalent to dropping the clutch on a manual tranny before you rev the engine into it's power band. Conversely, it is just as big a mistake to use too loose a converter for a given engine which will just eat gas and force an engine to run @ too high a speed throughout it's range. The off-ide throttle responsiveness will get sloppy too and that gets really irritating.

RPM ratings are just a guideline as to the relative tightness of a converter in a manufacturer's line. Doesn't really have an absolute meaning as stu points out.

In my experience, I have always been happier with a '2200' stall converter on an engine w/ the usual warm cam, mildly higher compression, relatively too big a carb & manifold. Stock one runs but the darned engine keeps stalling at stop signs all the time. The 2200 let the engine idle but still maintained responsiveness and fuel economy.

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